Used in Johnson's Method for Iron - (Microincineration), Mineral and Pigment stain. See Fenton R.H., Johnson, F.B., and Zimmerman, L.E., J. Histo-chem. Cytochem., 12:153-155, 1964. and Luna, L.G., (ed.), Manual of Histologic Staining Methods of the AFIP, 3rd edition, McGraw-Hill, NY, p.181, c 1968.